Building off the last section of OP, the Thymus is a part of the Endocrine System (also called 'the glands' in general; sometimes the glandular system).

Has anyone taken actual cognitive registry of how many athletes and entertainers are (in some cases) like a step above-a-Hobbit short?

(Not just) US Gymnasts, who are just the current group laying claims that speak to an institutionalized agenda favoring the sexual abuse of children.

This amounts to "their" reasoning for disallowing medical progress in the field of Endocrinology.

If you see an Endocrinologist, you'll commonly have to stop all other prescriptions for a while, because of the effect they have on glandular function - medicine as "a science" is so lost they discount pharmaceutical impacts on the glands as regular practice.

Tangentially, it explains cases like Nicole Kidman (famously raised by a psychiatrist who played large in the Australian 9th Circle cult, which is known to practice the ritualistic sexual abuse of children). She's tall, and raised in a network of elite Pedo Rapists. They can ensure the right hormones to offset the outcome (causing more growth so physical development isn't compromised), but the entire process would have been handled by "their doctors".

By this appraisal, what is rotten with medicine is how little the body's own Endocrine system is (allowed to be) understood, and how damaging impacts to appropriate (age-specific) glandular functions can become.